Not sure how long it has been like this but I just noticed that the $49.99 200GB plan has been updated so that it's no longer split into peak/off peak.
It used to be (100GB+100GB) but it is now just a single 200GB monthly usage quota.
Considering I hardly ever use off peak, this doubles my usage. I'm sure it's the same with others. The last post regarding this particular plan was for the upgrade in the usage quota (back in September) so I thought I'd just post this seeing as it hasn't already been posted.
As you allude to, this deal isn't new. Just keep in mind that this plan includes uploads.